Page History

...

Excerpt

The available selectable options could also be checked using the Opnstack CLI commands :

Code Block
$ openstack keypair list $ openstack image list $ openstack flavor list $ openstack network list

Write configuration files

Create a directory for your configuration and change directory into it:

Code Block
$ mkdir example-magnum-k8s $ cd example-magnum-k8s

Create the main configuration file to define the infrastructure:

Code Block
$ touch main.tf

Open the main.tf file in a text editor and fill it as needed like in the following minimal example :

Code Block

# Define required providers
terraform {
required_version = ">= 0.14.0"
  required_providers {
    openstack = {
      source  = "terraform-provider-openstack/openstack"
    }
  }
}

provider "openstack" {
  versioncloud = "~> 1.53.0"
    }
  }
}

# Configure the OpenStack Provider
provider "openstack" {
  # ...
}


resource "openstack_compute_instance_v2" "server-name"openstack"
}

variable "magnum_cluster_template" {
  description = <<EOT
  The name of the Magnum cluster template to create the kubernetes cluster with

  You may view a list of available template by running `openstack coe cluster template list`
  EOT
  type        = string
  default     = "cluster-template-name"
}

data "openstack_containerinfra_clustertemplate_v1" "clustertemplate" {
  name = var.magnum_cluster_template
}

resource "openstack_containerinfra_cluster_v1" "cluster" {
  name                = "servercluster-name"
  image_namecluster_template_id = data.openstack_containerinfra_clustertemplate_v1.clustertemplate.id
  master_count        = "imagemaster-namecount"
  master_flavor_name       = "master-flavor-name"
  key_pairnode_count          = "worker-node-count"
  flavor              = "keyworker-node-flavor-name"
  security_groupskeypair             = "ssh-keypair"
  fixed_network       = ["secgroupprivate-network-name-1", "secgroup-name-2", ...]

  network {
    name = "network-name"
  }
}"
  fixed_subnet        = "private-subnet-name"
  labels              = {
     monitoring_enabled   = "true"
     auto_healing_enabled = "true"
     }
  merge_labels        = "true"
  create_timeout      = "180"

}

Replace the following fields as desired:

server
```
cluster-template-name
```
image
```
cluster-name
```
flavor
```
master-
```
name
```
count
```
key
```
master-flavor-name
```
secgroup
```
worker-node-count
```
```
worker-node-flavor
```
name-1 , secgroup-name-2network
```
-name
```

For instance for ECMWF can be :

Code Block

resource "openstack_compute_instance_v2" "test-server" {
  name            = "test-server"
  image_name      = "Rocky-9.4-20240717094419"
  flavor_name     = "2cpu-2gbmem-30gbdisk"
  key_pair        = "mykey"
  security_groups = ["default", "ssh"]

  network {
    name = "private-cci1-ewcloud-ms-nmhs-project"
  }
}

Run Terraform or OpenTofu to create a Kubernetes cluster via OpenStack Magnum

Initialize the directory :

Section

border	true

Column

Terraform

Code Block
$ terraform init

Column

OpenTofu

Code Block
$ tofu init

Review the required changes:

Code Block
$ terraform plan

Apply the changes to create the Kubernetes cluster :

Section

border	true

Column

Terraform

Code Block
$ terraform apply

Column

OpenTofu

Code Block
$ tofu apply

Status can be then seen via:

Section

border	true

Column

Terraform

Code Block
$ terraform show

Column

OpenTofu

Code Block
$ tofu show

Destroy the Cluster

The created cluster can be then destroyed by simply running:

Section

border	true

Column

Terraform

Code Block
$ terraform destroy

Column

OpenTofu

Code Block
$ tofu destroy

...

Space shortcuts

Page tree

Versions Compared

Old Version 2

New Version 3

Key

Write configuration files

Run Terraform or OpenTofu to create a Kubernetes cluster via OpenStack Magnum

Destroy the Cluster